The Astronomical Observatories of Jai Singh c4.s1.19

c4.s1.19

¹ Mahendra's list is given in Appendix A. He gives the rate of precession as 54 seconds, and it may be noted that 18° 53′ / 54 secs. p.a. gives almost exactly 1259 years, and this gives the date for Ptolemy's catalogue as A.D. 111 approximately.